London Transport's small-bore tube tunnels represent a hostile environment in which to establish a speech link with moving trains. Deficiencies in the carrier wave system introduced on the Victoria line in 1968 led to experiments with multi-base stations and balanced leaky-feeder cables on the Bakerloo, but coaxial feeders with one-way repeaters are giving better results on the Northern line.
Voice communication in the tube
Sprechverbindung mit fahrenden U-Bahnzuegen
Railway Gazette International ; 132 , 4 ; 129-132
1976
4 Seiten, 4 Quellen
Article (Journal)
English
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